Measurement of the Ayy tensor analyzing power for the 1H(dyields,pp)n reaction in the symmetric constant relative energy geometry

Measurements of the unpolarized cross section and Ayy for the 1H(dyields,pp)n reaction were made using the 95 MeV tensor polarized deuteron beam at IUCF. The Symmetric Constant Relative Energy (SCRE) final-state geometry was chosen to enhance sensitivity to offshell and three-body force effects. In addition, the entire kinematic energy loci were analyzed for SCRE values of α ≥ 144 degree. The tensor analyzing power was found to exhibit a large and narrow minimum centered on the point of the locus opposite the SCRE point. The data were compared to various Faddeev calculations. Specifically, these calculations were conducted using either separable potentials or by treating the S-wave portions of the two-nucleon interaction exactly and all higher order waves perturbatively. The perturbative calculations overall did a better job of describing the analyzing power data. This was especially true in the interference region near α = 144 degree. Predictions for the unpolarized cross section were available for the perturbative calculations only. They tracked the data well for values of α > 160 degree